This had appeared a few times before at earlier stages of the draft process...

https://news.ycombinator.com/item?id=28088213 [244 comments]

Personally, I really like UUIDv7, except I transform the UUID to a 25-character string which has all the same properties except it doesn't look like a UUID. The last thing I want is my index of time-sortable UUIDs getting contaminated with with some UUIDv4 fully random ones. Since UUIDs may be generated and persisted in a distributed manner, it's a simple way to at least spot this.